1042400861637 has 4 divisors (see below), whose sum is σ = 1389867815520. Its totient is φ = 694933907756.

The previous prime is 1042400861633. The next prime is 1042400861651. The reversal of 1042400861637 is 7361680042401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1042400861637 - 2² = 1042400861633 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042400861633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173733476937 + ... + 173733476942.

It is an arithmetic number, because the mean of its divisors is an integer number (347466953880).

Almost surely, 2^{1042400861637} is an apocalyptic number.

It is an amenable number.

1042400861637 is a deficient number, since it is larger than the sum of its proper divisors (347466953883).

1042400861637 is an equidigital number, since it uses as much as digits as its factorization.

1042400861637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347466953882.

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 1042400861637 in words is "one trillion, forty-two billion, four hundred million, eight hundred sixty-one thousand, six hundred thirty-seven".