61831816078 has 8 divisors (see below), whose sum is σ = 92769720120. Its totient is φ = 30908576040.

The previous prime is 61831816049. The next prime is 61831816087. The reversal of 61831816078 is 87061813816.

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

It is a congruent number.

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, 3655453 + ... + 3672328.

It is an arithmetic number, because the mean of its divisors is an integer number (11596215015).

Almost surely, 2^61831816078 is an apocalyptic number.

61831816078 is a deficient number, since it is larger than the sum of its proper divisors (30937904042).

61831816078 is a wasteful number, since it uses less digits than its factorization.

61831816078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7332002.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 61831816078 in words is "sixty-one billion, eight hundred thirty-one million, eight hundred sixteen thousand, seventy-eight".