251005145564 has 24 divisors (see below), whose sum is σ = 449028111168. Its totient is φ = 122716437440.

The previous prime is 251005145543. The next prime is 251005145569. The reversal of 251005145564 is 465541500152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251005145569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429719 + ... + 828654.

It is an arithmetic number, because the mean of its divisors is an integer number (18709504632).

Almost surely, 2^251005145564 is an apocalyptic number.

It is an amenable number.

251005145564 is a deficient number, since it is larger than the sum of its proper divisors (198022965604).

251005145564 is a wasteful number, since it uses less digits than its factorization.

251005145564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259485 (or 1259483 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 251005145564 in words is "two hundred fifty-one billion, five million, one hundred forty-five thousand, five hundred sixty-four".