1620917950159 has 4 divisors (see below), whose sum is σ = 1706229421240. Its totient is φ = 1535606479080.

The previous prime is 1620917950153. The next prime is 1620917950181. The reversal of 1620917950159 is 9510597190261.

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 1620917950159 - 2¹⁹ = 1620917425871 is a prime.

It is a super-2 number, since 2×1620917950159² (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 (1620917950153) 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, 42655735512 + ... + 42655735549.

It is an arithmetic number, because the mean of its divisors is an integer number (426557355310).

Almost surely, 2^{1620917950159} is an apocalyptic number.

1620917950159 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1620917950159 is a deficient number, since it is larger than the sum of its proper divisors (85311471081).

1620917950159 is an equidigital number, since it uses as much as digits as its factorization.

1620917950159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85311471080.

The product of its (nonzero) digits is 1530900, while the sum is 55.

The spelling of 1620917950159 in words is "one trillion, six hundred twenty billion, nine hundred seventeen million, nine hundred fifty thousand, one hundred fifty-nine".