15553939393940 has 48 divisors (see below), whose sum is σ = 32988250648080. Its totient is φ = 6159681100800.

The previous prime is 15553939393931. The next prime is 15553939393961. The reversal of 15553939393940 is 4939393935551.

It can be written as a sum of positive squares in 8 ways, for example, as 112403290756 + 15441536103184 = 335266^2 + 3929572^2 .

It is a super-2 number, since 2×15553939393940² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44729384 + ... + 45075776.

It is an arithmetic number, because the mean of its divisors is an integer number (687255221835).

Almost surely, 2^{15553939393940} is an apocalyptic number.

15553939393940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15553939393940 is an abundant number, since it is smaller than the sum of its proper divisors (17434311254140).

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

15553939393940 is a wasteful number, since it uses less digits than its factorization.

15553939393940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368732 (or 368730 counting only the distinct ones).

The product of its (nonzero) digits is 265720500, while the sum is 68.

The spelling of 15553939393940 in words is "fifteen trillion, five hundred fifty-three billion, nine hundred thirty-nine million, three hundred ninety-three thousand, nine hundred forty".