61117779154 has 16 divisors (see below), whose sum is σ = 95180333400. Its totient is φ = 29398610304.

The previous prime is 61117779137. The next prime is 61117779157. The reversal of 61117779154 is 45197771116.

It can be written as a sum of positive squares in 4 ways, for example, as 48476149929 + 12641629225 = 220173^2 + 112435^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61117779098 and 61117779107.

It is not an unprimeable number, because it can be changed into a prime (61117779157) 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, 1886019 + ... + 1918150.

Almost surely, 2^61117779154 is an apocalyptic number.

61117779154 is a deficient number, since it is larger than the sum of its proper divisors (34062554246).

61117779154 is a wasteful number, since it uses less digits than its factorization.

61117779154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3804477.

The product of its digits is 370440, while the sum is 49.

The spelling of 61117779154 in words is "sixty-one billion, one hundred seventeen million, seven hundred seventy-nine thousand, one hundred fifty-four".