251565428378 has 16 divisors (see below), whose sum is σ = 411782779296. Its totient is φ = 114311738640.

The previous prime is 251565428371. The next prime is 251565428419. The reversal of 251565428378 is 873824565152.

It is not an unprimeable number, because it can be changed into a prime (251565428371) 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, 1738001 + ... + 1877172.

It is an arithmetic number, because the mean of its divisors is an integer number (25736423706).

Almost surely, 2^251565428378 is an apocalyptic number.

251565428378 is a deficient number, since it is larger than the sum of its proper divisors (160217350918).

251565428378 is a wasteful number, since it uses less digits than its factorization.

251565428378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618349.

The product of its digits is 16128000, while the sum is 56.

The spelling of 251565428378 in words is "two hundred fifty-one billion, five hundred sixty-five million, four hundred twenty-eight thousand, three hundred seventy-eight".