61662157 has 2 divisors, whose sum is σ = 61662158. Its totient is φ = 61662156.

The previous prime is 61662127. The next prime is 61662173. The reversal of 61662157 is 75126616.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53743561 + 7918596 = 7331^2 + 2814^2 .

It is a cyclic number.

It is not a de Polignac number, because 61662157 - 2¹⁵ = 61629389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61662127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30831078 + 30831079.

It is an arithmetic number, because the mean of its divisors is an integer number (30831079).

Almost surely, 2^61662157 is an apocalyptic number.

It is an amenable number.

61662157 is a deficient number, since it is larger than the sum of its proper divisors (1).

61662157 is an equidigital number, since it uses as much as digits as its factorization.

61662157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 61662157 is about 7852.5255173097. The cubic root of 61662157 is about 395.0689555416.

The spelling of 61662157 in words is "sixty-one million, six hundred sixty-two thousand, one hundred fifty-seven".