661547794114 has 4 divisors (see below), whose sum is σ = 992321691174. Its totient is φ = 330773897056.

The previous prime is 661547794097. The next prime is 661547794139. The reversal of 661547794114 is 411497745166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 411497745166 = 2 ⋅205748872583.

It can be written as a sum of positive squares in only one way, i.e., 634722923025 + 26824871089 = 796695^2 + 163783^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165386948527 + ... + 165386948530.

Almost surely, 2^661547794114 is an apocalyptic number.

661547794114 is a deficient number, since it is larger than the sum of its proper divisors (330773897060).

661547794114 is a wasteful number, since it uses less digits than its factorization.

661547794114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330773897059.

The product of its digits is 5080320, while the sum is 55.

The spelling of 661547794114 in words is "six hundred sixty-one billion, five hundred forty-seven million, seven hundred ninety-four thousand, one hundred fourteen".