61685691293 has 4 divisors (see below), whose sum is σ = 61793722848. Its totient is φ = 61577659740.

The previous prime is 61685691283. The next prime is 61685691311. The reversal of 61685691293 is 39219658616.

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 61685691293 - 2¹⁴ = 61685674909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61685691203) 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, 54014921 + ... + 54016062.

It is an arithmetic number, because the mean of its divisors is an integer number (15448430712).

Almost surely, 2^61685691293 is an apocalyptic number.

It is an amenable number.

61685691293 is a deficient number, since it is larger than the sum of its proper divisors (108031555).

61685691293 is a wasteful number, since it uses less digits than its factorization.

61685691293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108031554.

The product of its digits is 4199040, while the sum is 56.

The spelling of 61685691293 in words is "sixty-one billion, six hundred eighty-five million, six hundred ninety-one thousand, two hundred ninety-three".