61809906862 has 8 divisors (see below), whose sum is σ = 101143483992. Its totient is φ = 28095412200.

The previous prime is 61809906857. The next prime is 61809906877. The reversal of 61809906862 is 26860990816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×61809906862² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1404770589 + ... + 1404770632.

It is an arithmetic number, because the mean of its divisors is an integer number (12642935499).

Almost surely, 2^61809906862 is an apocalyptic number.

61809906862 is a deficient number, since it is larger than the sum of its proper divisors (39333577130).

61809906862 is a wasteful number, since it uses less digits than its factorization.

61809906862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809541234.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 61809906862 in words is "sixty-one billion, eight hundred nine million, nine hundred six thousand, eight hundred sixty-two".