5561102778 has 64 divisors (see below), whose sum is σ = 14073689088. Its totient is φ = 1422875520.

The previous prime is 5561102777. The next prime is 5561102791. The reversal of 5561102778 is 8772011655.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (5561102777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58875 + ... + 120782.

It is an arithmetic number, because the mean of its divisors is an integer number (219901392).

Almost surely, 2^5561102778 is an apocalyptic number.

5561102778 is an abundant number, since it is smaller than the sum of its proper divisors (8512586310).

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

5561102778 is a wasteful number, since it uses less digits than its factorization.

5561102778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179747.

The product of its (nonzero) digits is 117600, while the sum is 42.

The square root of 5561102778 is about 74572.8018650231. The cubic root of 5561102778 is about 1771.6868995610.

The spelling of 5561102778 in words is "five billion, five hundred sixty-one million, one hundred two thousand, seven hundred seventy-eight".