149165981057 has 4 divisors (see below), whose sum is σ = 149420097456. Its totient is φ = 148911864660.

The previous prime is 149165981039. The next prime is 149165981059. The reversal of 149165981057 is 750189561941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 750189561941 = 35809 ⋅20949749.

It is a cyclic number.

It is not a de Polignac number, because 149165981057 - 2¹⁸ = 149165718913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 149165980993 and 149165981011.

It is not an unprimeable number, because it can be changed into a prime (149165981059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127057319 + ... + 127058492.

It is an arithmetic number, because the mean of its divisors is an integer number (37355024364).

Almost surely, 2^149165981057 is an apocalyptic number.

It is an amenable number.

149165981057 is a deficient number, since it is larger than the sum of its proper divisors (254116399).

149165981057 is an equidigital number, since it uses as much as digits as its factorization.

149165981057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254116398.

The product of its (nonzero) digits is 2721600, while the sum is 56.

The spelling of 149165981057 in words is "one hundred forty-nine billion, one hundred sixty-five million, nine hundred eighty-one thousand, fifty-seven".