123660266400 has 216 divisors, whose sum is σ = 475698865824. Its totient is φ = 29978227200.

The previous prime is 123660266399. The next prime is 123660266437. The reversal of 123660266400 is 4662066321.

123660266400 is a `hidden beast` number, since 1 + 2 + 3 + 6 + 6 + 0 + 2 + 6 + 640 + 0 = 666.

It is a super-2 number, since 2×123660266400² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 701484 + ... + 859883.

It is an arithmetic number, because the mean of its divisors is an integer number (2202309564).

Almost surely, 2^123660266400 is an apocalyptic number.

123660266400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123660266400 is an abundant number, since it is smaller than the sum of its proper divisors (352038599424).

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

123660266400 is a wasteful number, since it uses less digits than its factorization.

123660266400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561404 (or 1561388 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 123660266400 in words is "one hundred twenty-three billion, six hundred sixty million, two hundred sixty-six thousand, four hundred".