61001211500 has 48 divisors (see below), whose sum is σ = 134275814400. Its totient is φ = 24208329600.

The previous prime is 61001211497. The next prime is 61001211511. The reversal of 61001211500 is 511210016.

It is a super-2 number, since 2×61001211500² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416825 + ... + 543824.

It is an arithmetic number, because the mean of its divisors is an integer number (2797412800).

Almost surely, 2^61001211500 is an apocalyptic number.

It is an amenable number.

61001211500 is an abundant number, since it is smaller than the sum of its proper divisors (73274602900).

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

61001211500 is a wasteful number, since it uses less digits than its factorization.

61001211500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960795 (or 960783 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 61001211500 its reverse (511210016), we get a palindrome (61512421516).

The spelling of 61001211500 in words is "sixty-one billion, one million, two hundred eleven thousand, five hundred".