7640201557 has 8 divisors (see below), whose sum is σ = 8090401176. Its totient is φ = 7190088192.

The previous prime is 7640201537. The next prime is 7640201563. The reversal of 7640201557 is 7551020467.

It can be written as a sum of positive squares in 4 ways, for example, as 746054596 + 6894146961 = 27314^2 + 83031^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7640201557 - 2²³ = 7631812949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640201537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287443 + ... + 312895.

It is an arithmetic number, because the mean of its divisors is an integer number (1011300147).

Almost surely, 2^7640201557 is an apocalyptic number.

It is an amenable number.

7640201557 is a deficient number, since it is larger than the sum of its proper divisors (450199619).

7640201557 is a wasteful number, since it uses less digits than its factorization.

7640201557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43127.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 7640201557 is about 87408.2465045490. The cubic root of 7640201557 is about 1969.5557207991. Note that the first 3 decimals are identical.

The spelling of 7640201557 in words is "seven billion, six hundred forty million, two hundred one thousand, five hundred fifty-seven".