61235401551 has 16 divisors (see below), whose sum is σ = 81913045344. Its totient is φ = 40690750464.

The previous prime is 61235401547. The next prime is 61235401553. The reversal of 61235401551 is 15510453216.

61235401551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61235401551 - 2² = 61235401547 is a prime.

It is a super-2 number, since 2×61235401551² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61235401553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4839405 + ... + 4852041.

It is an arithmetic number, because the mean of its divisors is an integer number (5119565334).

Almost surely, 2^61235401551 is an apocalyptic number.

61235401551 is a deficient number, since it is larger than the sum of its proper divisors (20677643793).

61235401551 is a wasteful number, since it uses less digits than its factorization.

61235401551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17770.

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 61235401551 its reverse (15510453216), we get a palindrome (76745854767).

The spelling of 61235401551 in words is "sixty-one billion, two hundred thirty-five million, four hundred one thousand, five hundred fifty-one".