1620957355 has 16 divisors (see below), whose sum is σ = 2052439200. Its totient is φ = 1225566720.

The previous prime is 1620957343. The next prime is 1620957379. The reversal of 1620957355 is 5537590261.

It is not a de Polignac number, because 1620957355 - 2¹⁵ = 1620924587 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19731 + ... + 60259.

It is an arithmetic number, because the mean of its divisors is an integer number (128277450).

Almost surely, 2^1620957355 is an apocalyptic number.

1620957355 is a deficient number, since it is larger than the sum of its proper divisors (431481845).

1620957355 is a wasteful number, since it uses less digits than its factorization.

1620957355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40974.

The product of its (nonzero) digits is 283500, while the sum is 43.

The square root of 1620957355 is about 40261.1146765710. The cubic root of 1620957355 is about 1174.6915997620.

The spelling of 1620957355 in words is "one billion, six hundred twenty million, nine hundred fifty-seven thousand, three hundred fifty-five".