7820156201 has 64 divisors (see below), whose sum is σ = 9762923520. Its totient is φ = 6167715840.

The previous prime is 7820156177. The next prime is 7820156203. The reversal of 7820156201 is 1026510287.

It is a de Polignac number, because none of the positive numbers 2^k-7820156201 is a prime.

It is a super-2 number, since 2×7820156201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7820156203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22153241 + ... + 22153593.

It is an arithmetic number, because the mean of its divisors is an integer number (152545680).

Almost surely, 2^7820156201 is an apocalyptic number.

It is an amenable number.

7820156201 is a deficient number, since it is larger than the sum of its proper divisors (1942767319).

7820156201 is a wasteful number, since it uses less digits than its factorization.

7820156201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 7820156201 is about 88431.6470557911. The cubic root of 7820156201 is about 1984.8992879510.

Adding to 7820156201 its reverse (1026510287), we get a palindrome (8846666488).

The spelling of 7820156201 in words is "seven billion, eight hundred twenty million, one hundred fifty-six thousand, two hundred one".