149642315521 has 4 divisors (see below), whose sum is σ = 149644998592. Its totient is φ = 149639632452.

The previous prime is 149642315503. The next prime is 149642315531. The reversal of 149642315521 is 125513246941.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 149642315521 - 2⁵ = 149642315489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149642315531) 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, 1256061 + ... + 1370026.

It is an arithmetic number, because the mean of its divisors is an integer number (37411249648).

Almost surely, 2^149642315521 is an apocalyptic number.

It is an amenable number.

149642315521 is a deficient number, since it is larger than the sum of its proper divisors (2683071).

149642315521 is an equidigital number, since it uses as much as digits as its factorization.

149642315521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683070.

The product of its digits is 259200, while the sum is 43.

The spelling of 149642315521 in words is "one hundred forty-nine billion, six hundred forty-two million, three hundred fifteen thousand, five hundred twenty-one".