10661801536 has 21 divisors (see below), whose sum is σ = 21158651739. Its totient is φ = 5330487744.

The previous prime is 10661801533. The next prime is 10661801587. The reversal of 10661801536 is 63510816601.

The square root of 10661801536 is 103256.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×10661801536² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10661801495 and 10661801504.

It is not an unprimeable number, because it can be changed into a prime (10661801533) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 819595 + ... + 832501.

Almost surely, 2^10661801536 is an apocalyptic number.

10661801536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

10661801536 is the 103256-th square number.

It is an amenable number.

10661801536 is a deficient number, since it is larger than the sum of its proper divisors (10496850203).

10661801536 is an frugal number, since it uses more digits than its factorization.

10661801536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25826 (or 12909 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 10661801536 in words is "ten billion, six hundred sixty-one million, eight hundred one thousand, five hundred thirty-six".