61197358278 has 16 divisors (see below), whose sum is σ = 139879676160. Its totient is φ = 17484959496.

The previous prime is 61197358273. The next prime is 61197358283. The reversal of 61197358278 is 87285379116.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61197358273) and next prime (61197358283).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61197358273) 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, 728539938 + ... + 728540021.

It is an arithmetic number, because the mean of its divisors is an integer number (8742479760).

Almost surely, 2^61197358278 is an apocalyptic number.

61197358278 is an abundant number, since it is smaller than the sum of its proper divisors (78682317882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61197358278 is a wasteful number, since it uses less digits than its factorization.

61197358278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457079971.

The product of its digits is 5080320, while the sum is 57.

The spelling of 61197358278 in words is "sixty-one billion, one hundred ninety-seven million, three hundred fifty-eight thousand, two hundred seventy-eight".