61330778373651 has 16 divisors (see below), whose sum is σ = 82081964264448. Its totient is φ = 40733447832000.

The previous prime is 61330778373637. The next prime is 61330778373679. The reversal of 61330778373651 is 15637387703316.

It is a de Polignac number, because none of the positive numbers 2^k-61330778373651 is a prime.

It is a super-2 number, since 2×61330778373651² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61330778333651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3173611 + ... + 11520996.

It is an arithmetic number, because the mean of its divisors is an integer number (5130122766528).

Almost surely, 2^{61330778373651} is an apocalyptic number.

61330778373651 is a deficient number, since it is larger than the sum of its proper divisors (20751185890797).

61330778373651 is a wasteful number, since it uses less digits than its factorization.

61330778373651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14699842.

The product of its (nonzero) digits is 40007520, while the sum is 60.

The spelling of 61330778373651 in words is "sixty-one trillion, three hundred thirty billion, seven hundred seventy-eight million, three hundred seventy-three thousand, six hundred fifty-one".