1555156661157 has 24 divisors (see below), whose sum is σ = 2450610578208. Its totient is φ = 942495847200.

The previous prime is 1555156661119. The next prime is 1555156661159. The reversal of 1555156661157 is 7511666515551.

It is not a de Polignac number, because 1555156661157 - 2¹⁰ = 1555156660133 is a prime.

It is a super-2 number, since 2×1555156661157² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555156661159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4358907 + ... + 4702167.

It is an arithmetic number, because the mean of its divisors is an integer number (102108774092).

Almost surely, 2^{1555156661157} is an apocalyptic number.

It is an amenable number.

1555156661157 is a deficient number, since it is larger than the sum of its proper divisors (895453917051).

1555156661157 is a wasteful number, since it uses less digits than its factorization.

1555156661157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389041 (or 389038 counting only the distinct ones).

The product of its digits is 4725000, while the sum is 54.

The spelling of 1555156661157 in words is "one trillion, five hundred fifty-five billion, one hundred fifty-six million, six hundred sixty-one thousand, one hundred fifty-seven".