1251610722042 has 64 divisors (see below), whose sum is σ = 2566917872640. Its totient is φ = 406630111104.

The previous prime is 1251610722029. The next prime is 1251610722053. The reversal of 1251610722042 is 2402270161521.

It is a junction number, because it is equal to n+sod(n) for n = 1251610721994 and 1251610722012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294980373 + ... + 294984615.

It is an arithmetic number, because the mean of its divisors is an integer number (40108091760).

Almost surely, 2^{1251610722042} is an apocalyptic number.

1251610722042 is an abundant number, since it is smaller than the sum of its proper divisors (1315307150598).

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

1251610722042 is a wasteful number, since it uses less digits than its factorization.

1251610722042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6467.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 1251610722042 its reverse (2402270161521), we get a palindrome (3653880883563).

The spelling of 1251610722042 in words is "one trillion, two hundred fifty-one billion, six hundred ten million, seven hundred twenty-two thousand, forty-two".