61621212201535 has 24 divisors (see below), whose sum is σ = 86387358756816. Its totient is φ = 42073195489920.

The previous prime is 61621212201509. The next prime is 61621212201539. The reversal of 61621212201535 is 53510221212616.

It is not a de Polignac number, because 61621212201535 - 2¹⁹ = 61621211677247 is a prime.

It is a super-2 number, since 2×61621212201535² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61621212201494 and 61621212201503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61621212201539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 539675001 + ... + 539789170.

It is an arithmetic number, because the mean of its divisors is an integer number (3599473281534).

Almost surely, 2^{61621212201535} is an apocalyptic number.

61621212201535 is a deficient number, since it is larger than the sum of its proper divisors (24766146555281).

61621212201535 is a wasteful number, since it uses less digits than its factorization.

61621212201535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079464423 (or 1079464416 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 61621212201535 in words is "sixty-one trillion, six hundred twenty-one billion, two hundred twelve million, two hundred one thousand, five hundred thirty-five".