10661512501 has 8 divisors (see below), whose sum is σ = 10679736320. Its totient is φ = 10643306688.

The previous prime is 10661512457. The next prime is 10661512517. The reversal of 10661512501 is 10521516601.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10661512501 - 2⁷ = 10661512373 is a prime.

It is a super-2 number, since 2×10661512501² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10661512501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10661512801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1655650 + ... + 1662076.

It is an arithmetic number, because the mean of its divisors is an integer number (1334967040).

Almost surely, 2^10661512501 is an apocalyptic number.

It is an amenable number.

10661512501 is a deficient number, since it is larger than the sum of its proper divisors (18223819).

10661512501 is a wasteful number, since it uses less digits than its factorization.

10661512501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9003.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 10661512501 in words is "ten billion, six hundred sixty-one million, five hundred twelve thousand, five hundred one".