61699429890 has 128 divisors (see below), whose sum is σ = 194102231040. Its totient is φ = 13647787200.

The previous prime is 61699429889. The next prime is 61699429901. The reversal of 61699429890 is 9892499616.

61699429890 is a `hidden beast` number, since 61 + 69 + 9 + 429 + 8 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 467946 + ... + 585125.

It is an arithmetic number, because the mean of its divisors is an integer number (1516423680).

Almost surely, 2^61699429890 is an apocalyptic number.

61699429890 is an abundant number, since it is smaller than the sum of its proper divisors (132402801150).

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

61699429890 is a wasteful number, since it uses less digits than its factorization.

61699429890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053125 (or 1053119 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 61699429890 in words is "sixty-one billion, six hundred ninety-nine million, four hundred twenty-nine thousand, eight hundred ninety".