10556621881 has 8 divisors (see below), whose sum is σ = 11496408840. Its totient is φ = 9635083392.

The previous prime is 10556621851. The next prime is 10556621891. The reversal of 10556621881 is 18812665501.

It can be written as a sum of positive squares in 4 ways, for example, as 94400656 + 10462221225 = 9716^2 + 102285^2 .

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 10556621881 - 2¹⁷ = 10556490809 is a prime.

It is a super-2 number, since 2×10556621881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10556621851) 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, 4560910 + ... + 4563223.

It is an arithmetic number, because the mean of its divisors is an integer number (1437051105).

Almost surely, 2^10556621881 is an apocalyptic number.

It is an amenable number.

10556621881 is a deficient number, since it is larger than the sum of its proper divisors (939786959).

10556621881 is an equidigital number, since it uses as much as digits as its factorization.

10556621881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9124235.

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 10556621881 in words is "ten billion, five hundred fifty-six million, six hundred twenty-one thousand, eight hundred eighty-one".