157755649 has 2 divisors, whose sum is σ = 157755650. Its totient is φ = 157755648.

The previous prime is 157755629. The next prime is 157755667. The reversal of 157755649 is 946557751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90630400 + 67125249 = 9520^2 + 8193^2 .

It is a cyclic number.

It is not a de Polignac number, because 157755649 - 2²¹ = 155658497 is a prime.

It is a super-2 number, since 2×157755649² = 49773689582822402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157755629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78877824 + 78877825.

It is an arithmetic number, because the mean of its divisors is an integer number (78877825).

Almost surely, 2^157755649 is an apocalyptic number.

It is an amenable number.

157755649 is a deficient number, since it is larger than the sum of its proper divisors (1).

157755649 is an equidigital number, since it uses as much as digits as its factorization.

157755649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323000, while the sum is 49.

The square root of 157755649 is about 12560.0815682065. The cubic root of 157755649 is about 540.3331837272. Note that the first 3 decimals are identical.

It can be divided in two parts, 157755 and 649, that added together give a square (158404 = 398²).

The spelling of 157755649 in words is "one hundred fifty-seven million, seven hundred fifty-five thousand, six hundred forty-nine".