1620662523 has 4 divisors (see below), whose sum is σ = 2160883368. Its totient is φ = 1080441680.

The previous prime is 1620662509. The next prime is 1620662539. The reversal of 1620662523 is 3252660261.

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 1620662523 - 2¹³ = 1620654331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620612523) 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, 270110418 + ... + 270110423.

It is an arithmetic number, because the mean of its divisors is an integer number (540220842).

Almost surely, 2^1620662523 is an apocalyptic number.

1620662523 is a deficient number, since it is larger than the sum of its proper divisors (540220845).

1620662523 is an equidigital number, since it uses as much as digits as its factorization.

1620662523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540220844.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 1620662523 is about 40257.4530118337. The cubic root of 1620662523 is about 1174.6203748419.

The spelling of 1620662523 in words is "one billion, six hundred twenty million, six hundred sixty-two thousand, five hundred twenty-three".