1613640040251 has 4 divisors (see below), whose sum is σ = 2151520053672. Its totient is φ = 1075760026832.

The previous prime is 1613640040247. The next prime is 1613640040289. The reversal of 1613640040251 is 1520400463161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1613640040251 - 2² = 1613640040247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1613640030251) 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, 268940006706 + ... + 268940006711.

It is an arithmetic number, because the mean of its divisors is an integer number (537880013418).

Almost surely, 2^{1613640040251} is an apocalyptic number.

1613640040251 is a deficient number, since it is larger than the sum of its proper divisors (537880013421).

1613640040251 is an equidigital number, since it uses as much as digits as its factorization.

1613640040251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537880013420.

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 1613640040251 in words is "one trillion, six hundred thirteen billion, six hundred forty million, forty thousand, two hundred fifty-one".