51001661610 has 64 divisors (see below), whose sum is σ = 138034396800. Its totient is φ = 13397446656.

The previous prime is 51001661603. The next prime is 51001661617. The reversal of 51001661610 is 1616610015.

It is an interprime number because it is at equal distance from previous prime (51001661603) and next prime (51001661617).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51001661617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1391575 + ... + 1427754.

It is an arithmetic number, because the mean of its divisors is an integer number (2156787450).

Almost surely, 2^51001661610 is an apocalyptic number.

51001661610 is an abundant number, since it is smaller than the sum of its proper divisors (87032735190).

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

51001661610 is a wasteful number, since it uses less digits than its factorization.

51001661610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2819412 (or 2819406 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The spelling of 51001661610 in words is "fifty-one billion, one million, six hundred sixty-one thousand, six hundred ten".