61812272657 has 4 divisors (see below), whose sum is σ = 62040362496. Its totient is φ = 61584182820.

The previous prime is 61812272647. The next prime is 61812272677. The reversal of 61812272657 is 75627221816.

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 61812272657 - 2¹⁴ = 61812256273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61812272647) 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, 114044513 + ... + 114045054.

It is an arithmetic number, because the mean of its divisors is an integer number (15510090624).

Almost surely, 2^61812272657 is an apocalyptic number.

It is an amenable number.

61812272657 is a deficient number, since it is larger than the sum of its proper divisors (228089839).

61812272657 is a wasteful number, since it uses less digits than its factorization.

61812272657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228089838.

The product of its digits is 564480, while the sum is 47.

The spelling of 61812272657 in words is "sixty-one billion, eight hundred twelve million, two hundred seventy-two thousand, six hundred fifty-seven".