1023553655681 has 16 divisors (see below), whose sum is σ = 1040011092480. Its totient is φ = 1007267788800.

The previous prime is 1023553655659. The next prime is 1023553655687. The reversal of 1023553655681 is 1865563553201.

It is a cyclic number.

It is not a de Polignac number, because 1023553655681 - 2⁶ = 1023553655617 is a prime.

It is a super-2 number, since 2×1023553655681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023553655687) 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, 6891701 + ... + 7038653.

It is an arithmetic number, because the mean of its divisors is an integer number (65000693280).

Almost surely, 2^{1023553655681} is an apocalyptic number.

It is an amenable number.

1023553655681 is a deficient number, since it is larger than the sum of its proper divisors (16457436799).

1023553655681 is a wasteful number, since it uses less digits than its factorization.

1023553655681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147536.

The product of its (nonzero) digits is 3240000, while the sum is 50.

The spelling of 1023553655681 in words is "one trillion, twenty-three billion, five hundred fifty-three million, six hundred fifty-five thousand, six hundred eighty-one".