157771643 has 4 divisors (see below), whose sum is σ = 157994880. Its totient is φ = 157548408.

The previous prime is 157771639. The next prime is 157771657. The reversal of 157771643 is 346177751.

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

It is a cyclic number.

It is not a de Polignac number, because 157771643 - 2² = 157771639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157771643.

It is not an unprimeable number, because it can be changed into a prime (157771613) 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, 110555 + ... + 111972.

It is an arithmetic number, because the mean of its divisors is an integer number (39498720).

Almost surely, 2^157771643 is an apocalyptic number.

157771643 is a deficient number, since it is larger than the sum of its proper divisors (223237).

157771643 is an equidigital number, since it uses as much as digits as its factorization.

157771643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223236.

The product of its digits is 123480, while the sum is 41.

The square root of 157771643 is about 12560.7182517561. The cubic root of 157771643 is about 540.3514436056.

The spelling of 157771643 in words is "one hundred fifty-seven million, seven hundred seventy-one thousand, six hundred forty-three".