1630720664351 has 4 divisors (see below), whose sum is σ = 1653688561104. Its totient is φ = 1607752767600.

The previous prime is 1630720664323. The next prime is 1630720664411. The reversal of 1630720664351 is 1534660270361.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630720664351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630720660351) 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, 11483948270 + ... + 11483948411.

It is an arithmetic number, because the mean of its divisors is an integer number (413422140276).

Almost surely, 2^{1630720664351} is an apocalyptic number.

1630720664351 is a deficient number, since it is larger than the sum of its proper divisors (22967896753).

1630720664351 is an equidigital number, since it uses as much as digits as its factorization.

1630720664351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22967896752.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 1630720664351 in words is "one trillion, six hundred thirty billion, seven hundred twenty million, six hundred sixty-four thousand, three hundred fifty-one".