661504162162 has 4 divisors (see below), whose sum is σ = 992256243246. Its totient is φ = 330752081080.

The previous prime is 661504162159. The next prime is 661504162169. The reversal of 661504162162 is 261261405166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 605002396761 + 56501765401 = 777819^2 + 237701^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (661504162169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165376040539 + ... + 165376040542.

Almost surely, 2^661504162162 is an apocalyptic number.

661504162162 is a deficient number, since it is larger than the sum of its proper divisors (330752081084).

661504162162 is a wasteful number, since it uses less digits than its factorization.

661504162162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330752081083.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 661504162162 in words is "six hundred sixty-one billion, five hundred four million, one hundred sixty-two thousand, one hundred sixty-two".