625655197440 has 1080 divisors, whose sum is σ = 2771016117408. Its totient is φ = 131980492800.

The previous prime is 625655197421. The next prime is 625655197451. The reversal of 625655197440 is 44791556526.

625655197440 is a `hidden beast` number, since 6 + 2 + 5 + 6 + 5 + 5 + 197 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (1080).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 119 ways as a sum of consecutive naturals, for example, 122650890 + ... + 122655990.

Almost surely, 2^625655197440 is an apocalyptic number.

625655197440 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 625655197440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385508058704).

625655197440 is an abundant number, since it is smaller than the sum of its proper divisors (2145360919968).

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

625655197440 is a wasteful number, since it uses less digits than its factorization.

625655197440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167 (or 5131 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 54.

The spelling of 625655197440 in words is "six hundred twenty-five billion, six hundred fifty-five million, one hundred ninety-seven thousand, four hundred forty".