501111661152 has 48 divisors (see below), whose sum is σ = 1322095409712. Its totient is φ = 166189309440.

The previous prime is 501111661109. The next prime is 501111661181. The reversal of 501111661152 is 251166111105.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×501111661152² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13229599 + ... + 13267422.

It is an arithmetic number, because the mean of its divisors is an integer number (27543654369).

Almost surely, 2^501111661152 is an apocalyptic number.

It is an amenable number.

501111661152 is an abundant number, since it is smaller than the sum of its proper divisors (820983748560).

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

501111661152 is a wasteful number, since it uses less digits than its factorization.

501111661152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26497231 (or 26497223 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 30.

Adding to 501111661152 its reverse (251166111105), we get a palindrome (752277772257).

The spelling of 501111661152 in words is "five hundred one billion, one hundred eleven million, six hundred sixty-one thousand, one hundred fifty-two".