51618409590 has 128 divisors (see below), whose sum is σ = 139383078912. Its totient is φ = 12125877120.

The previous prime is 51618409589. The next prime is 51618409627. The reversal of 51618409590 is 9590481615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1787809 + ... + 1816451.

It is an arithmetic number, because the mean of its divisors is an integer number (1088930304).

Almost surely, 2^51618409590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51618409590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69691539456).

51618409590 is an abundant number, since it is smaller than the sum of its proper divisors (87764669322).

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

51618409590 is a wasteful number, since it uses less digits than its factorization.

51618409590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28834.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 51618409590 in words is "fifty-one billion, six hundred eighteen million, four hundred nine thousand, five hundred ninety".