20762585805661 has 16 divisors (see below), whose sum is σ = 24084067930624. Its totient is φ = 17529980626224.

The previous prime is 20762585805641. The next prime is 20762585805673. The reversal of 20762585805661 is 16650858526702.

It is a cyclic number.

It is not a de Polignac number, because 20762585805661 - 2¹⁵ = 20762585772893 is a prime.

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 20762585805661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20762585805631) 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, 8064646 + ... + 10322968.

It is an arithmetic number, because the mean of its divisors is an integer number (1505254245664).

Almost surely, 2^{20762585805661} is an apocalyptic number.

It is an amenable number.

20762585805661 is a deficient number, since it is larger than the sum of its proper divisors (3321482124963).

20762585805661 is a wasteful number, since it uses less digits than its factorization.

20762585805661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278000.

The product of its (nonzero) digits is 48384000, while the sum is 61.

The spelling of 20762585805661 in words is "twenty trillion, seven hundred sixty-two billion, five hundred eighty-five million, eight hundred five thousand, six hundred sixty-one".