21763551616653 has 32 divisors (see below), whose sum is σ = 38082496343040. Its totient is φ = 10710702092160.

The previous prime is 21763551616649. The next prime is 21763551616687. The reversal of 21763551616653 is 35661615536712.

It is a happy number.

It is not a de Polignac number, because 21763551616653 - 2² = 21763551616649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 21763551616593 and 21763551616602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21763551615653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2479324800 + ... + 2479333577.

It is an arithmetic number, because the mean of its divisors is an integer number (1190078010720).

Almost surely, 2^{21763551616653} is an apocalyptic number.

It is an amenable number.

21763551616653 is a deficient number, since it is larger than the sum of its proper divisors (16318944726387).

21763551616653 is a wasteful number, since it uses less digits than its factorization.

21763551616653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4958658417.

The product of its digits is 20412000, while the sum is 57.

The spelling of 21763551616653 in words is "twenty-one trillion, seven hundred sixty-three billion, five hundred fifty-one million, six hundred sixteen thousand, six hundred fifty-three".