6155397540 has 288 divisors, whose sum is σ = 20258574336. Its totient is φ = 1508855040.

The previous prime is 6155397539. The next prime is 6155397551. The reversal of 6155397540 is 457935516.

6155397540 is a `hidden beast` number, since 6 + 1 + 5 + 539 + 75 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12639177 + ... + 12639663.

It is an arithmetic number, because the mean of its divisors is an integer number (70342272).

Almost surely, 2^6155397540 is an apocalyptic number.

6155397540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6155397540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10129287168).

6155397540 is an abundant number, since it is smaller than the sum of its proper divisors (14103176796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6155397540 is a wasteful number, since it uses less digits than its factorization.

6155397540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The square root of 6155397540 is about 78456.3416174881. The cubic root of 6155397540 is about 1832.6746341813.

The spelling of 6155397540 in words is "six billion, one hundred fifty-five million, three hundred ninety-seven thousand, five hundred forty".