1520344640623 has 4 divisors (see below), whose sum is σ = 1520378824888. Its totient is φ = 1520310456360.

The previous prime is 1520344640609. The next prime is 1520344640669. The reversal of 1520344640623 is 3260464430251.

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 1520344640623 - 2²¹ = 1520342543471 is a prime.

It is a super-2 number, since 2×1520344640623² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520345640623) 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, 17025333 + ... + 17114398.

It is an arithmetic number, because the mean of its divisors is an integer number (380094706222).

Almost surely, 2^{1520344640623} is an apocalyptic number.

1520344640623 is a deficient number, since it is larger than the sum of its proper divisors (34184265).

1520344640623 is an equidigital number, since it uses as much as digits as its factorization.

1520344640623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34184264.

The product of its (nonzero) digits is 414720, while the sum is 40.

The spelling of 1520344640623 in words is "one trillion, five hundred twenty billion, three hundred forty-four million, six hundred forty thousand, six hundred twenty-three".