61551423042 has 16 divisors (see below), whose sum is σ = 125120926272. Its totient is φ = 20180794320.

The previous prime is 61551423013. The next prime is 61551423053. The reversal of 61551423042 is 24032415516.

It is a junction number, because it is equal to n+sod(n) for n = 61551422994 and 61551423012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84086278 + ... + 84087009.

It is an arithmetic number, because the mean of its divisors is an integer number (7820057892).

Almost surely, 2^61551423042 is an apocalyptic number.

61551423042 is an abundant number, since it is smaller than the sum of its proper divisors (63569503230).

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

61551423042 is a wasteful number, since it uses less digits than its factorization.

61551423042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168173353.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 61551423042 its reverse (24032415516), we get a palindrome (85583838558).

The spelling of 61551423042 in words is "sixty-one billion, five hundred fifty-one million, four hundred twenty-three thousand, forty-two".