61697533945 has 8 divisors (see below), whose sum is σ = 74053035144. Its totient is φ = 49347364224.

The previous prime is 61697533943. The next prime is 61697533957. The reversal of 61697533945 is 54933579616.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8386816 + 61689147129 = 2896^2 + 248373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61697533945 - 2¹ = 61697533943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61697533945.

It is not an unprimeable number, because it can be changed into a prime (61697533943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1307364 + ... + 1353733.

It is an arithmetic number, because the mean of its divisors is an integer number (9256629393).

Almost surely, 2^61697533945 is an apocalyptic number.

It is an amenable number.

61697533945 is a deficient number, since it is larger than the sum of its proper divisors (12355501199).

61697533945 is a wasteful number, since it uses less digits than its factorization.

61697533945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665739.

The product of its digits is 18370800, while the sum is 58.

The spelling of 61697533945 in words is "sixty-one billion, six hundred ninety-seven million, five hundred thirty-three thousand, nine hundred forty-five".