10506399778 has 12 divisors (see below), whose sum is σ = 18332595702. Its totient is φ = 4502742720.

The previous prime is 10506399769. The next prime is 10506399791. The reversal of 10506399778 is 87799360501.

It can be written as a sum of positive squares in only one way, i.e., 9008477569 + 1497922209 = 94913^2 + 38703^2 .

It is a super-2 number, since 2×10506399778² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53603983 + ... + 53604178.

Almost surely, 2^10506399778 is an apocalyptic number.

10506399778 is a deficient number, since it is larger than the sum of its proper divisors (7826195924).

10506399778 is a wasteful number, since it uses less digits than its factorization.

10506399778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107208177 (or 107208170 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 55.

The spelling of 10506399778 in words is "ten billion, five hundred six million, three hundred ninety-nine thousand, seven hundred seventy-eight".