1561015026620 has 48 divisors (see below), whose sum is σ = 3746566692288. Its totient is φ = 535186490880.

The previous prime is 1561015026619. The next prime is 1561015026629. The reversal of 1561015026620 is 266205101651.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561015026629) 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, 4186544 + ... + 4544136.

It is an arithmetic number, because the mean of its divisors is an integer number (78053472756).

Almost surely, 2^{1561015026620} is an apocalyptic number.

1561015026620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561015026620 is an abundant number, since it is smaller than the sum of its proper divisors (2185551665668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561015026620 is a wasteful number, since it uses less digits than its factorization.

1561015026620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388790 (or 388788 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 1561015026620 in words is "one trillion, five hundred sixty-one billion, fifteen million, twenty-six thousand, six hundred twenty".