39897755557 has 12 divisors (see below), whose sum is σ = 43859582368. Its totient is φ = 36266531400.

The previous prime is 39897755519. The next prime is 39897755567. The reversal of 39897755557 is 75555779893.

It is a de Polignac number, because none of the positive numbers 2^k-39897755557 is a prime.

It is a super-2 number, since 2×39897755557² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (416745000) is a multiple of the sum of its prime factors (37800).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39897755567) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1644082 + ... + 1668172.

Almost surely, 2^39897755557 is an apocalyptic number.

It is an amenable number.

39897755557 is a deficient number, since it is larger than the sum of its proper divisors (3961826811).

39897755557 is a wasteful number, since it uses less digits than its factorization.

39897755557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37800 (or 37789 counting only the distinct ones).

The product of its digits is 416745000, while the sum is 70.

The spelling of 39897755557 in words is "thirty-nine billion, eight hundred ninety-seven million, seven hundred fifty-five thousand, five hundred fifty-seven".