20510102661 has 16 divisors (see below), whose sum is σ = 27940445184. Its totient is φ = 13376826864.

The previous prime is 20510102621. The next prime is 20510102689. The reversal of 20510102661 is 16620101502.

It is not a de Polignac number, because 20510102661 - 2¹⁴ = 20510086277 is a prime.

It is a super-2 number, since 2×20510102661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20510102621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318366 + ... + 377328.

It is an arithmetic number, because the mean of its divisors is an integer number (1746277824).

Almost surely, 2^20510102661 is an apocalyptic number.

It is an amenable number.

20510102661 is a deficient number, since it is larger than the sum of its proper divisors (7430342523).

20510102661 is a wasteful number, since it uses less digits than its factorization.

20510102661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61480.

The product of its (nonzero) digits is 720, while the sum is 24.

The spelling of 20510102661 in words is "twenty billion, five hundred ten million, one hundred two thousand, six hundred sixty-one".