10661156121 has 64 divisors (see below), whose sum is σ = 18612228096. Its totient is φ = 5263315200.

The previous prime is 10661156113. The next prime is 10661156131. The reversal of 10661156121 is 12165116601.

It is not a de Polignac number, because 10661156121 - 2³ = 10661156113 is a prime.

It is a super-2 number, since 2×10661156121² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10661156131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 827751 + ... + 840531.

It is an arithmetic number, because the mean of its divisors is an integer number (290816064).

Almost surely, 2^10661156121 is an apocalyptic number.

10661156121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10661156121 is a deficient number, since it is larger than the sum of its proper divisors (7951071975).

10661156121 is a wasteful number, since it uses less digits than its factorization.

10661156121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12982.

The product of its (nonzero) digits is 2160, while the sum is 30.

The spelling of 10661156121 in words is "ten billion, six hundred sixty-one million, one hundred fifty-six thousand, one hundred twenty-one".