157780061 has 2 divisors, whose sum is σ = 157780062. Its totient is φ = 157780060.

The previous prime is 157780037. The next prime is 157780127. The reversal of 157780061 is 160087751.

157780061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125574436 + 32205625 = 11206^2 + 5675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157780061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157780361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78890030 + 78890031.

It is an arithmetic number, because the mean of its divisors is an integer number (78890031).

Almost surely, 2^157780061 is an apocalyptic number.

It is an amenable number.

157780061 is a deficient number, since it is larger than the sum of its proper divisors (1).

157780061 is an equidigital number, since it uses as much as digits as its factorization.

157780061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 157780061 is about 12561.0533395890. The cubic root of 157780061 is about 540.3610536924.

The spelling of 157780061 in words is "one hundred fifty-seven million, seven hundred eighty thousand, sixty-one".