1620005701157 has 4 divisors (see below), whose sum is σ = 1620009839820. Its totient is φ = 1620001562496.

The previous prime is 1620005701103. The next prime is 1620005701159. The reversal of 1620005701157 is 7511075000261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 792244186561 + 827761514596 = 890081^2 + 909814^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620005701157 - 2³⁶ = 1551286224421 is a prime.

It is a super-2 number, since 2×1620005701157² (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 (1620005701159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1412738 + ... + 2288195.

It is an arithmetic number, because the mean of its divisors is an integer number (405002459955).

Almost surely, 2^{1620005701157} is an apocalyptic number.

It is an amenable number.

1620005701157 is a deficient number, since it is larger than the sum of its proper divisors (4138663).

1620005701157 is an equidigital number, since it uses as much as digits as its factorization.

1620005701157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4138662.

The product of its (nonzero) digits is 14700, while the sum is 35.

The spelling of 1620005701157 in words is "one trillion, six hundred twenty billion, five million, seven hundred one thousand, one hundred fifty-seven".