61201951778 has 8 divisors (see below), whose sum is σ = 100148648400. Its totient is φ = 27819068980.

The previous prime is 61201951739. The next prime is 61201951807. The reversal of 61201951778 is 87715910216.

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

It is a super-2 number, since 2×61201951778² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1390953428 + ... + 1390953471.

It is an arithmetic number, because the mean of its divisors is an integer number (12518581050).

Almost surely, 2^61201951778 is an apocalyptic number.

61201951778 is a deficient number, since it is larger than the sum of its proper divisors (38946696622).

61201951778 is a wasteful number, since it uses less digits than its factorization.

61201951778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781906912.

The product of its (nonzero) digits is 211680, while the sum is 47.

The spelling of 61201951778 in words is "sixty-one billion, two hundred one million, nine hundred fifty-one thousand, seven hundred seventy-eight".