251550316641 has 16 divisors (see below), whose sum is σ = 362083608320. Its totient is φ = 154421700480.

The previous prime is 251550316639. The next prime is 251550316643. The reversal of 251550316641 is 146613055152.

It is an interprime number because it is at equal distance from previous prime (251550316639) and next prime (251550316643).

It is not a de Polignac number, because 251550316641 - 2¹ = 251550316639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251550316641.

It is not an unprimeable number, because it can be changed into a prime (251550316643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7869145 + ... + 7901046.

It is an arithmetic number, because the mean of its divisors is an integer number (22630225520).

Almost surely, 2^251550316641 is an apocalyptic number.

It is an amenable number.

251550316641 is a deficient number, since it is larger than the sum of its proper divisors (110533291679).

251550316641 is a wasteful number, since it uses less digits than its factorization.

251550316641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15770616.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 251550316641 in words is "two hundred fifty-one billion, five hundred fifty million, three hundred sixteen thousand, six hundred forty-one".