155787890491 has 2 divisors, whose sum is σ = 155787890492. Its totient is φ = 155787890490.

The previous prime is 155787890477. The next prime is 155787890567. The reversal of 155787890491 is 194098787551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155787890491 - 2⁵ = 155787890459 is a prime.

It is not a weakly prime, because it can be changed into another prime (155787890411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77893945245 + 77893945246.

It is an arithmetic number, because the mean of its divisors is an integer number (77893945246).

Almost surely, 2^155787890491 is an apocalyptic number.

155787890491 is a deficient number, since it is larger than the sum of its proper divisors (1).

155787890491 is an equidigital number, since it uses as much as digits as its factorization.

155787890491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25401600, while the sum is 64.

The spelling of 155787890491 in words is "one hundred fifty-five billion, seven hundred eighty-seven million, eight hundred ninety thousand, four hundred ninety-one".