145387666520 has 32 divisors (see below), whose sum is σ = 328238734320. Its totient is φ = 57956580480.

The previous prime is 145387666513. The next prime is 145387666621. The reversal of 145387666520 is 25666783541.

It is a happy number.

It is a super-2 number, since 2×145387666520² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6190826 + ... + 6214265.

Almost surely, 2^145387666520 is an apocalyptic number.

145387666520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145387666520 is an abundant number, since it is smaller than the sum of its proper divisors (182851067800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145387666520 is a wasteful number, since it uses less digits than its factorization.

145387666520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12405395 (or 12405391 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 53.

The spelling of 145387666520 in words is "one hundred forty-five billion, three hundred eighty-seven million, six hundred sixty-six thousand, five hundred twenty".