61111111010 has 32 divisors (see below), whose sum is σ = 114152243760. Its totient is φ = 23527044352.

The previous prime is 61111111007. The next prime is 61111111027. The reversal of 61111111010 is 1011111116.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 10652923369 + 50458187641 = 103213^2 + 224629^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240449 + ... + 424308.

Almost surely, 2^61111111010 is an apocalyptic number.

61111111010 is a deficient number, since it is larger than the sum of its proper divisors (53041132750).

61111111010 is a wasteful number, since it uses less digits than its factorization.

61111111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665110.

The product of its (nonzero) digits is 6, while the sum is 14.

Adding to 61111111010 its reverse (1011111116), we get a palindrome (62122222126).

The spelling of 61111111010 in words is "sixty-one billion, one hundred eleven million, one hundred eleven thousand, ten".