15575274540 has 672 divisors, whose sum is σ = 60922036224. Its totient is φ = 3262187520.

The previous prime is 15575274521. The next prime is 15575274569. The reversal of 15575274540 is 4547257551.

15575274540 is a `hidden beast` number, since 1 + 5 + 57 + 52 + 7 + 4 + 540 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 81545845 + ... + 81546035.

It is an arithmetic number, because the mean of its divisors is an integer number (90657792).

Almost surely, 2^15575274540 is an apocalyptic number.

15575274540 is a gapful number since it is divisible by the number (10) 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 15575274540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30461018112).

15575274540 is an abundant number, since it is smaller than the sum of its proper divisors (45346761684).

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

15575274540 is a wasteful number, since it uses less digits than its factorization.

15575274540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 980000, while the sum is 45.

The spelling of 15575274540 in words is "fifteen billion, five hundred seventy-five million, two hundred seventy-four thousand, five hundred forty".