123455566690 has 16 divisors (see below), whose sum is σ = 222252712128. Its totient is φ = 49374961776.

The previous prime is 123455566687. The next prime is 123455566709. The reversal of 123455566690 is 96665554321.

It is a super-2 number, since 2×123455566690² (a number of 23 digits) contains 22 as substring.

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, 836472 + ... + 972931.

It is an arithmetic number, because the mean of its divisors is an integer number (13890794508).

Almost surely, 2^123455566690 is an apocalyptic number.

123455566690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123455566690 is a deficient number, since it is larger than the sum of its proper divisors (98797145438).

123455566690 is a wasteful number, since it uses less digits than its factorization.

123455566690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816233.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 123455566690 in words is "one hundred twenty-three billion, four hundred fifty-five million, five hundred sixty-six thousand, six hundred ninety".