61662557 has 4 divisors (see below), whose sum is σ = 67268256. Its totient is φ = 56056860.

The previous prime is 61662551. The next prime is 61662569. The reversal of 61662557 is 75526616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61662557 - 2¹² = 61658461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61662557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61662551) 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, 2802833 + ... + 2802854.

It is an arithmetic number, because the mean of its divisors is an integer number (16817064).

Almost surely, 2^61662557 is an apocalyptic number.

It is an amenable number.

61662557 is a deficient number, since it is larger than the sum of its proper divisors (5605699).

61662557 is a wasteful number, since it uses less digits than its factorization.

61662557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5605698.

The product of its digits is 75600, while the sum is 38.

The square root of 61662557 is about 7852.5509867813. The cubic root of 61662557 is about 395.0698098054.

The spelling of 61662557 in words is "sixty-one million, six hundred sixty-two thousand, five hundred fifty-seven".