61816651 has 6 divisors (see below), whose sum is σ = 66937740. Its totient is φ = 57061368.

The previous prime is 61816649. The next prime is 61816687. The reversal of 61816651 is 15661816.

It is not a de Polignac number, because 61816651 - 2¹ = 61816649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61816621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182721 + ... + 183058.

It is an arithmetic number, because the mean of its divisors is an integer number (11156290).

Almost surely, 2^61816651 is an apocalyptic number.

61816651 is a deficient number, since it is larger than the sum of its proper divisors (5121089).

61816651 is a wasteful number, since it uses less digits than its factorization.

61816651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365805 (or 365792 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 61816651 is about 7862.3565805679. The cubic root of 61816651 is about 395.3986276460.

The spelling of 61816651 in words is "sixty-one million, eight hundred sixteen thousand, six hundred fifty-one".