61278794068 has 6 divisors (see below), whose sum is σ = 107237889626. Its totient is φ = 30639397032.

The previous prime is 61278794029. The next prime is 61278794081. The reversal of 61278794068 is 86049787216.

It can be written as a sum of positive squares in only one way, i.e., 61275061444 + 3732624 = 247538^2 + 1932^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7659849255 + ... + 7659849262.

Almost surely, 2^61278794068 is an apocalyptic number.

It is an amenable number.

61278794068 is a deficient number, since it is larger than the sum of its proper divisors (45959095558).

61278794068 is a wasteful number, since it uses less digits than its factorization.

61278794068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15319698521 (or 15319698519 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 61278794068 in words is "sixty-one billion, two hundred seventy-eight million, seven hundred ninety-four thousand, sixty-eight".