261423423030 has 256 divisors, whose sum is σ = 799970328576. Its totient is φ = 53093214720.

The previous prime is 261423423017. The next prime is 261423423043. The reversal of 261423423030 is 30324324162.

It is an interprime number because it is at equal distance from previous prime (261423423017) and next prime (261423423043).

It is a super-2 number, since 2×261423423030² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 118665909 + ... + 118668111.

It is an arithmetic number, because the mean of its divisors is an integer number (3124884096).

Almost surely, 2^261423423030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261423423030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (399985164288).

261423423030 is an abundant number, since it is smaller than the sum of its proper divisors (538546905546).

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

261423423030 is a wasteful number, since it uses less digits than its factorization.

261423423030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371.

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 261423423030 its reverse (30324324162), we get a palindrome (291747747192).

The spelling of 261423423030 in words is "two hundred sixty-one billion, four hundred twenty-three million, four hundred twenty-three thousand, thirty".