1020561020451 has 80 divisors (see below), whose sum is σ = 1847703965184. Its totient is φ = 548016212736.

The previous prime is 1020561020443. The next prime is 1020561020473. The reversal of 1020561020451 is 1540201650201.

1020561020451 is a `hidden beast` number, since 1 + 0 + 2 + 0 + 5 + 610 + 2 + 0 + 45 + 1 = 666.

It is not a de Polignac number, because 1020561020451 - 2³ = 1020561020443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1020561020051) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6115546 + ... + 6280208.

Almost surely, 2^{1020561020451} is an apocalyptic number.

1020561020451 is a deficient number, since it is larger than the sum of its proper divisors (827142944733).

1020561020451 is a wasteful number, since it uses less digits than its factorization.

1020561020451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165342 (or 165333 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 1020561020451 its reverse (1540201650201), we get a palindrome (2560762670652).

The spelling of 1020561020451 in words is "one trillion, twenty billion, five hundred sixty-one million, twenty thousand, four hundred fifty-one".