1561140295937 has 8 divisors (see below), whose sum is σ = 1575233187720. Its totient is φ = 1547052272640.

The previous prime is 1561140295931. The next prime is 1561140295969. The reversal of 1561140295937 is 7395920411651.

It is a happy number.

It is a Cunningham number, because it is equal to 1249456²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 27508212736 + 1533632083201 = 165856^2 + 1238399^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1561140295937 - 2¹⁸ = 1561140033793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561140295931) 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, 571364 + ... + 1857077.

It is an arithmetic number, because the mean of its divisors is an integer number (196904148465).

Almost surely, 2^{1561140295937} is an apocalyptic number.

It is an amenable number.

1561140295937 is a deficient number, since it is larger than the sum of its proper divisors (14092891783).

1561140295937 is a wasteful number, since it uses less digits than its factorization.

1561140295937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434243.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 1561140295937 in words is "one trillion, five hundred sixty-one billion, one hundred forty million, two hundred ninety-five thousand, nine hundred thirty-seven".