61814280657 has 4 divisors (see below), whose sum is σ = 82419040880. Its totient is φ = 41209520436.

The previous prime is 61814280559. The next prime is 61814280659. The reversal of 61814280657 is 75608241816.

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 not a de Polignac number, because 61814280657 - 2¹⁴ = 61814264273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61814280659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10302380107 + ... + 10302380112.

It is an arithmetic number, because the mean of its divisors is an integer number (20604760220).

Almost surely, 2^61814280657 is an apocalyptic number.

It is an amenable number.

61814280657 is a deficient number, since it is larger than the sum of its proper divisors (20604760223).

61814280657 is a wasteful number, since it uses less digits than its factorization.

61814280657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20604760222.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 61814280657 in words is "sixty-one billion, eight hundred fourteen million, two hundred eighty thousand, six hundred fifty-seven".