1561072464557 has 8 divisors (see below), whose sum is σ = 1582854019320. Its totient is φ = 1539301639680.

The previous prime is 1561072464547. The next prime is 1561072464571. The reversal of 1561072464557 is 7554642701651.

It can be written as a sum of positive squares in 4 ways, for example, as 61931797321 + 1499140667236 = 248861^2 + 1224394^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561072464557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561072464499 and 1561072464508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561072464547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2389244 + ... + 2971637.

It is an arithmetic number, because the mean of its divisors is an integer number (197856752415).

Almost surely, 2^{1561072464557} is an apocalyptic number.

It is an amenable number.

1561072464557 is a deficient number, since it is larger than the sum of its proper divisors (21781554763).

1561072464557 is an equidigital number, since it uses as much as digits as its factorization.

1561072464557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5364943.

The product of its (nonzero) digits is 7056000, while the sum is 53.

The spelling of 1561072464557 in words is "one trillion, five hundred sixty-one billion, seventy-two million, four hundred sixty-four thousand, five hundred fifty-seven".