263857925661 has 16 divisors (see below), whose sum is σ = 383826081600. Its totient is φ = 159900254720.

The previous prime is 263857925657. The next prime is 263857925671. The reversal of 263857925661 is 166529758362.

It is a cyclic number.

It is not a de Polignac number, because 263857925661 - 2² = 263857925657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 263857925595 and 263857925604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263857925621) 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, 58765 + ... + 728813.

It is an arithmetic number, because the mean of its divisors is an integer number (23989130100).

Almost surely, 2^263857925661 is an apocalyptic number.

It is an amenable number.

263857925661 is a deficient number, since it is larger than the sum of its proper divisors (119968155939).

263857925661 is a wasteful number, since it uses less digits than its factorization.

263857925661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681996.

The product of its digits is 32659200, while the sum is 60.

The spelling of 263857925661 in words is "two hundred sixty-three billion, eight hundred fifty-seven million, nine hundred twenty-five thousand, six hundred sixty-one".