61205706520993 has 4 divisors (see below), whose sum is σ = 61206898991940. Its totient is φ = 61204514050048.

The previous prime is 61205706520969. The next prime is 61205706521027. The reversal of 61205706520993 is 39902560750216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45779405538304 + 15426300982689 = 6766048^2 + 3927633^2 .

It is a cyclic number.

It is not a de Polignac number, because 61205706520993 - 2¹³ = 61205706512801 is a prime.

It is a super-2 number, since 2×61205706520993² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61205706520393) 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, 596158480 + ... + 596261137.

It is an arithmetic number, because the mean of its divisors is an integer number (15301724747985).

Almost surely, 2^{61205706520993} is an apocalyptic number.

It is an amenable number.

61205706520993 is a deficient number, since it is larger than the sum of its proper divisors (1192470947).

61205706520993 is a wasteful number, since it uses less digits than its factorization.

61205706520993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192470946.

The product of its (nonzero) digits is 6123600, while the sum is 55.

The spelling of 61205706520993 in words is "sixty-one trillion, two hundred five billion, seven hundred six million, five hundred twenty thousand, nine hundred ninety-three".