51188661090 has 48 divisors (see below), whose sum is σ = 152103451968. Its totient is φ = 11700265248.

The previous prime is 51188661077. The next prime is 51188661091. The reversal of 51188661090 is 9016688115.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (51188661091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40625292 + ... + 40626551.

It is an arithmetic number, because the mean of its divisors is an integer number (3168821916).

Almost surely, 2^51188661090 is an apocalyptic number.

51188661090 is an abundant number, since it is smaller than the sum of its proper divisors (100914790878).

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

51188661090 is a wasteful number, since it uses less digits than its factorization.

51188661090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81251863 (or 81251860 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The spelling of 51188661090 in words is "fifty-one billion, one hundred eighty-eight million, six hundred sixty-one thousand, ninety".