157066649 has 4 divisors (see below), whose sum is σ = 157123764. Its totient is φ = 157009536.

The previous prime is 157066633. The next prime is 157066661. The reversal of 157066649 is 946660751.

It is a happy number.

157066649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946660751 = 139 ⋅6810509.

It can be written as a sum of positive squares in 2 ways, for example, as 16810000 + 140256649 = 4100^2 + 11843^2 .

It is a cyclic number.

It is not a de Polignac number, because 157066649 - 2⁴ = 157066633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157066619) 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, 24212 + ... + 30005.

It is an arithmetic number, because the mean of its divisors is an integer number (39280941).

Almost surely, 2^157066649 is an apocalyptic number.

It is an amenable number.

157066649 is a deficient number, since it is larger than the sum of its proper divisors (57115).

157066649 is an equidigital number, since it uses as much as digits as its factorization.

157066649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57114.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 157066649 is about 12532.6233885807. The cubic root of 157066649 is about 539.5453981483.

The spelling of 157066649 in words is "one hundred fifty-seven million, sixty-six thousand, six hundred forty-nine".