1616156601 has 4 divisors (see below), whose sum is σ = 2154875472. Its totient is φ = 1077437732.

The previous prime is 1616156593. The next prime is 1616156603. The reversal of 1616156601 is 1066516161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1066516161 = 3 ⋅355505387.

It is a cyclic number.

It is not a de Polignac number, because 1616156601 - 2³ = 1616156593 is a prime.

It is a super-2 number, since 2×1616156601² = 5223924317911746402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1616156603) 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, 269359431 + ... + 269359436.

It is an arithmetic number, because the mean of its divisors is an integer number (538718868).

Almost surely, 2^1616156601 is an apocalyptic number.

It is an amenable number.

1616156601 is a deficient number, since it is larger than the sum of its proper divisors (538718871).

1616156601 is an equidigital number, since it uses as much as digits as its factorization.

1616156601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538718870.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1616156601 is about 40201.4502350351. The cubic root of 1616156601 is about 1173.5307668494.

The spelling of 1616156601 in words is "one billion, six hundred sixteen million, one hundred fifty-six thousand, six hundred one".